\begin{tikzpicture}[every node/.style={minimum size=1cm,draw}, >=Stealth]
    \foreach \text  [count=\i] in {
        x, \times 3, -5, \div 2
    } {
        \pgfmathsetmacro{\y}{-\i * 1.5}
        \draw (0, \y) node {$\text$};
        \draw [->] (0, \y-.5) -- (0, \y-1);
    }
    \draw (0, -7.5) node {$y$};
\end{tikzpicture}
